Decamethylcyclopentasiloxane

Decamethylcyclopentasiloxane
	Structural formula
	Ball-and-stick model of the molecule as found in the crystal structure determined by single-crystal X-ray diffraction
	Sample of decamethylcyclopentasiloxane
Names
	Preferred IUPAC name Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
	Other names Cyclopentamethicone; Cyclic dimethylsiloxane pentamer; D5; D5; 2,2,4,4,6,6,8,8,10,10-Decamethylcyclopentasiloxane; GreenEarth;
Identifiers
CAS Number	541-02-6 ;
3D model (JSmol)	Interactive image; Interactive image;
Beilstein Reference	1800166
ChEMBL	ChEMBL1885178;
ChemSpider	10451 ;
DrugBank	DB11244;
ECHA InfoCard	100.007.969
EC Number	208-764-9;
MeSH	Decamethylcyclopentasiloxane
PubChem CID	10913;
RTECS number	GY5945200;
UNII	0THT5PCI0R ;
CompTox Dashboard (EPA)	DTXSID1027184 ;
	InChI InChI=1S/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3 Key: XMSXQFUHVRWGNA-UHFFFAOYSA-N ; InChI=1/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3 Key: XMSXQFUHVRWGNA-UHFFFAOYAC;
	SMILES C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1; O1[Si](O[Si](O[Si](O[Si](O[Si]1(C)C)(C)C)(C)C)(C)C)(C)C;
Properties
Chemical formula	[(CH3)2SiO]5
Molar mass	370.770 g·mol−1
Appearance	Colourless liquid
Density	0.958 g/cm3
Melting point	−47 °C; −53 °F; 226 K
Boiling point	210 °C (410 °F; 483 K)
Solubility in water	17.03±0.72 ppb (23 °C)
log P	8.07
Vapor pressure	20.4±1.1 Pa (25 °C)
Viscosity	3.74 cP
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H226, H361, H412, H413
Precautionary statements	P201, P202, P210, P233, P240, P241, P242, P243, P273, P280, P281, P303+P361+P353, P308+P313, P370+P378, P403+P235, P405, P501
NFPA 704 (fire diamond)	1 2 0
Flash point	73 °C (163 °F; 346 K)
Safety data sheet (SDS)	External MSDS
Related compounds
Related Organosilicon compounds	Octamethylcyclotetrasiloxane
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Decamethylcyclopentasiloxane, also known as D₅ and D5, is an organosilicon compound with the formula [(CH₃)₂SiO]₅. It is a colorless and odorless liquid that is slightly volatile. It is used in various cosmetic products. It also is used as a dry cleaning solvent and has been marketed as an "eco-friendly" and "green" alternative to perchloroethylene in the 2000s, under the tradename GreenEarth. Decamethylcyclopentasiloxane is persistent in nature and possibly bioaccumulative. Decamethylcyclopentasiloxane is considered non-toxic but its long-term health effects are unknown.